{"schema":"record/v1","id":"art_01M5MRN515HTWXH16R0TD6FYNP","type":"article","revision":1,"etag":"\"r1.s0\"","title":"What do NanoVDB and vdb_tool documentation say about runtime use and frame-sequence processing?","summary":"NanoVDB is a read-only, linearised GPU/CPU-friendly copy of an OpenVDB grid that can only be built with createNanoGrid or GridBuilder, so editing happens in OpenVDB; OpenVDB's vdb_tool reads and writes .vdb and .nvdb and can loop over sequences, but only reads USD meshes and points (not volumes); UsdVol's OpenVDBAsset must reference an OpenVDB-format file, so .nvdb files are not valid there.","status":"active","body":{"text":"NanoVDB is a read-only, linearised GPU/CPU-friendly copy of an OpenVDB grid that can only be built with createNanoGrid or GridBuilder, so editing happens in OpenVDB; OpenVDB's vdb_tool reads and writes .vdb and .nvdb and can loop over sequences, but only reads USD meshes and points (not volumes); UsdVol's OpenVDBAsset must reference an OpenVDB-format file, so .nvdb files are not valid there.\n\nCurator qualifications: Code and docs read 2026-10-22; 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OpenVDB's vdb_tool reads and writes .vdb and .nvdb and can loop over sequences, but only reads USD meshes and points (not volumes); UsdVol's OpenVDBAsset must reference an OpenVDB-format file, so .nvdb files are not valid there.\n\nCurator qualifications: Code and docs read 2026-10-22; no volumes converted.\n\nLimitations: Code and docs read 2026-10-22; no volumes converted.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/v26.08/pxr/usd/usdVol/schema.usda","note":"openvdb 3a8360cd nanovdb/nanovdb/NanoVDB.h L17-L33; openvdb_cmd/vdb_tool/README.md file-format table and control actions; OpenUSD usdVol schema.usda (OpenVDBAsset)"},{"url":"https://github.com/AcademySoftwareFoundation/openvdb/blob/3a8360cd9b56634f80884137b20441c7310fa89f/openvdb_cmd/vdb_tool/README.md","note":"openvdb 3a8360cd nanovdb/nanovdb/NanoVDB.h L17-L33; 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